Spherical hinge based on double orthogonal elastic leaf springs
An elastic reed and bi-orthogonal technology, applied in joints, manipulators, shafts, etc., can solve the problems of short fatigue fracture life of flexible hinges, weak flexible parts, and difficult grinding of knife marks.
Active Publication Date: 2018-05-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
However, flexible hinges are often cut from a whole piece of material, and the flexible part is often weak, and the knife marks are not easy to polish and smooth, and it is easy to stress concentration and fatigue fracture after long-term use
[0004]
The traditional structural forms of spherical hinges and flexible hinges are prone to fatigue fracture and have a short life span. Due to their respective characteristics, they have been widely used in different occasions. However, the excellent characteristics and functions of flexible hinges have not been developed to achieve precise displacement resolution. , simple and compact structure, providing three rotational degrees of freedom of the spherical joint
Method used
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[0020] The present invention will be described in detail below in combination with specific embodiments.
[0021] The elastic reed is often used as an energy storage element because the reed material has high elasticity and elastic recovery performance, or the elastic reed has good out-of-plane elasticity and good in-plane stiffness, and is used between relative moving components The connecting piece acts as an equivalent hinge. Because the surface quality of the elastic reed is generally high, it can effectively avoid stress concentration, so it has a good fatigue life; and the thickness is easy to choose, so it can ensure high displacement resolution and high repeat positioning accuracy, and it is also easy to design strength and stiffness.
[0022] see figure 1 , in the coordinate system shown in the figure, the lower edge of the elastic reed is fixedly installed in the OYZ plane, and the upper edge is installed externally to connect the moving components. It can be seen ...
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The invention discloses a spherical hinge based on double orthogonal elastic leaf springs. According to the technical scheme, the spherical hinge based on the double orthogonal elastic leaf springs comprises an elastic leaf spring A and an elastic leaf spring B which are completely identical in shape and in symmetrical half-surrounded shapes. According to the leaf spring A, the bottom is providedwith a section A3, the middle part of an opening portion is provided with two sections A2, and the front end of the opening portion is provided with two sections A1. According to the leaf spring B, the bottom is provided with a section B3, the middle part of the opening portion is provided with two sections B2, the front end of the opening portion is provided with two sections B1. The elastic leafspring A and the elastic leaf spring B are orthogonally and perpendicularly arranged in the manner that the openings are opposite. The section A3 is fixed to the base. The section B3 is externally connected with a moving component. The section A1 and the section B1 are fixedly connected through four intermediate connection pieces. The sections A2 and the sections B2 are free. The spherical hingebased on the double orthogonal elastic leaf springs has the beneficial effects that three rotation freedom degrees can be achieved, the structure is compact and symmetrical, and external connection isconvenient.
Description
technical field [0001] The invention belongs to the technical field of precision machinery and parallel robots, and relates to a ball chain based on double orthogonal elastic reeds. Background technique [0002] Ball joints are hinges that can provide three degrees of freedom of rotation. Traditional ball joints generally use a spherical pair - a ball seat and a ball joint - in the form of a structure. The typical product is a joint bearing. Traditional spherical joints have extremely high requirements on the processing technology of the spherical pair, and often require precise tolerances and good surface quality. The cost is high, but there are still friction and gaps that are inevitable. After long-term operation, wear and gaps or gaps will increase. , and often require lubrication and regular maintenance. [0003] The flexible hinge technology uses the elastic deformation of the material to realize the relative rotation between adjacent relatively rigid components, ther...
Claims
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IPC IPC(8): F16C11/12B25J9/00B25J17/00
CPCF16C11/12B25J9/00B25J17/00F16C2322/59
Inventor 杨德华程颖吴常铖费飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS